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Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
If I use four of these diodes for a rectifier will it handle 25A 50A or 100A I researched diodes and rectifiers I don't know if it will increase current handling capability.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well, what are you talking about? Using it as a fullwave bridge rectifier, it would have a 25 amp capacity and 600 volts, if you parallel 4 of them it will be 100amps and 600 volts, and if you series it will be 25 amps and 2400 volts.
Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
Arcstarter wrote ...
Well, what are you talking about? Using it as a fullwave bridge rectifier, it would have a 25 amp capacity and 600 volts, if you parallel 4 of them it will be 100amps and 600 volts, and if you series it will be 25 amps and 2400 volts.
Thank you I am still not sure which one to use for best fullwave low voltage rectification.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well, it would actually be much better to have lower rated diodes in fact. The higher the voltage, usually the higher the forward voltage drop, which means more heating, and the voltage will fall. You would want fullwave rectification for pretty much everything though. The ZVS would not like halfwave AT ALL. It would heat more it seems, and it may kill mosfets faster. Also, it would be more heat on the diode. So what you want is fullwave rectification and good filtering. I would use 15000uf or more(that is because i use 15000uf though :P) after the fullwave rectifier. You can just go to radio shack and get a fullwave rectifier though. They have some that are ok with 50 volt and 25 amp rating. 50 volts is actually too low for mine, so i bought for pretty much nothing because mine runs at 52 volts without any load.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
You can use them for things that need ultra fast recovery time (HF stuff). For mains freq, it's a bit of overkill to have a bunch of those as a bridge.
If you were to make a ZVS flyback driver, it seems like it would be fine to use them.
Also, it's not a very good idea to parallel diodes because of how they don't share current perfectly. There will be a slight difference in voltage drop between them so when paralleled, the one with the lowest voltage drop will see more current going through it than the other. If you do want to parallel diodes, make sure that you derate the total current that you would expect to see going through it. I don't know how much you would derate them though.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Its somewhat true and somewhat not true. Its not ture in normal diodes up to around 1000v or close but when you get up in the high KV range the voltage drops are a lot higher. I had some HV diodes that had a 12v voltage drop but at 10KV 12v is insignificant. For the diodes he has that isn't the case. Theyre probably .7 or somewhere in that range.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Tom540 wrote ...
Its somewhat true and somewhat not true. Its not ture in normal diodes up to around 1000v or close but when you get up in the high KV range the voltage drops are a lot higher.
Yes, because they are many junctions in series. Most standard Si diodes have ~0.5-1V forward drop no matter of their reverse breakdown voltage.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Dr. Kilovolt wrote ...
Tom540 wrote ...
Its somewhat true and somewhat not true. Its not ture in normal diodes up to around 1000v or close but when you get up in the high KV range the voltage drops are a lot higher.
Yes, because they are many junctions in series. Most standard Si diodes have ~0.5-1V forward drop no matter of their reverse breakdown voltage.
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